Method and apparatus for producing amorphous ribbon

Abstract

A method and apparatus are provided for producing an amorphous ribbon by ejecting and rapidly solidifying molten alloy on a circumferential surface of a rapidly rotating cooling roll, wherein the cooling roll is polished online during amorphous ribbon production. When the circumferential surface of the cooling roll after peeling off the ribbon is polished using a polishing member, the circumferential surface of the cooling roll is polished continuously or intermittently across its lateral direction while differentiating the polishing mode in accordance with the surface properties.

1. A method for producing an amorphous ribbon, the method comprising the steps of:
 ejecting and solidifying molten alloy on a circumferential surface of a rotating cooling roll; 
 peeling solidified alloy ribbon from the cooling roll; 
 polishing the circumferential surface of the cooling roll with polishing members continuously or intermittently across the cooling roll in a lateral direction of the circumferential surface of the cooling roll; 
 differentiating the polishing mode in accordance with surface properties of the cooling roll across the lateral direction; 
 aligning at least two or more of the polishing members having different polishing characteristics; and 
 polishing in contact with the circumferential surface of the cooling roll over a length equal to 0.2% or greater of the cooling roll circumference. 
 
     
     
       2. The method for producing an amorphous ribbon according to  claim 1 , further comprising differentiating the polishing mode using at least two polishing members having different polishing characteristics in combination, wherein the polishing members are selected from the group consisting of a cylindrical brush roll comprising a polishing material of abrasive grains braided into a resin fiber rod, an abrasive pad, an abrasive paper, and an abrasive belt. 
     
     
       3. The method for producing an amorphous ribbon according to  claim 1 , further comprising the step of cleaning the cooling roll surface after completion of the polishing. 
     
     
       4. The method for producing an amorphous ribbon according to  claim 2 , further comprising the step of cleaning the cooling roll surface after completion of the polishing.